i) I've discussed this before, but I'd like to approach it from a different angle. Both amils and premils (and postmils, I suppose) posit chronological gaps in some Bible prophecies. That can look like special pleading. A face-saving device to savage your eschatological timetable. Or, more seriously, a face-saving device to salvage the prophecy itself.
Now, I do think Christians of whatever eschatological outlook (amil premil, postmil) can be at risk of postulating ad hoc gaps to protect their position. And I'm not sure we can entirely guard against that. We need to make allowance for the possibility that our prophetic school of thought is mistaken. (That's different from saying the prophecy itself is mistaken.) And we need to have general evidence for our eschatological outlook. We can't be constantly patching it up.
ii) On a related note, some people are suspicious or dubious about Bible prophecy because they've seen how millennial cults devise creative interpretations when their founding prophet makes false predictions. And they think Christian apologists are guilty of the same antics when defending the Bible.
iii) And I think skepticism is often justified in assessing prophetic claimants. As even Scripture says, "many false prophets have gone out into the world" (1 Jn 4:1). The Bible warns of false prophets.
iv) That said, I'd like to make a preliminary point. If there's evidence outside of Scripture that some people can sense the future (e.g. premonitions, premonitory dreams), then that establishes both the possibility and reality of genuine prophetic foresight. And it doesn't take many examples to establish the existence or occurrence of a particular phenomenon. If you have that baseline, then it should affect the presumption you bring to Scripture. At the very least, that ought to make you more sympathetic.
v) The next point I'd like to explore is whether the notion of prophetic gaps is inherently suspect. Let's consider the idea of Bible prophecy. Even if you don't initially believe it, ask yourself what it would be like in case it's for real. What would a seer experience?
We need to remind ourselves that Bible prophecy is typically a two-stage process. That's easy forget because all we have is the record of vision. So that makes it look like a one-stage process. Since we're reading a prophecy, our default mode is to judge it on those terms. But that's misleading. A visionary revelation didn't originate in writing.
Let's begin with our ordinary waking perception of temporal succession. We experience the "passage of time" continuously. Instant by instant.
I can't jump ahead from 1:00 to 2:00. I can't skip over the intervening time. Rather, I must live through each moment to get from 1:00 to 2:00. Unless I suffer a blackout, there are no chronological gaps in my experience of real time.
Compare that to visionary revelation. Imagine what it's like to be a seer. Suppose, one night, you experience a series of prophetic dreams. It's like watching a movie in your head. You see one scene after another. The scenes keep changing. Then you wake up and write them down.
Now, writing is a different medium than seeing. There are no gaps on the printed page. When you write down what you saw, you don't insert blank spaces between one section and another. Rather, you just write down what you saw in the order in which you remember having seen it–in tidy, evenly spaced paragraphs.
So when we read a prophecy, the written record is continuous. There are no breaks on the page.
Yet that's just an artifact of how to represent an experience in writing. It's a category mistake to confuse the nature of the underlying experience with the nature of a textual description.
Let's go back to the experience of visionary revelation. Suppose these are visions of the future. A series of visions. But here's the thing: there's nothing in what he sees that shows him how much time passes between one scene and another. Serial visionary revelation is discontinuous. A vision of disconnected scenes.
So there's nothing in the visionary experience to indicate the actual duration of the intervals between one future scene and another. There's an implicit gap between each scene and the next scene. Abrupt scene changes.
There's no indication that the envisioned events occur in rapid succession, or evenly spaced intervals. If you think about it, it would be rather disorienting to witness. The seer's imagination is bombarded with shifting, disjointed scenes. He saw this, that, and the other thing.
So the fulfillment of these visions could well be staggered. That's not a case of wedging gaps between a continuum. To the contrary, there's already "space" between one scene and another. And there's no telling how much space separates one scene from another. It could be a brief interlude or centuries apart.
Consider movies where the action cuts ahead to ten years later. Say you were watching a scene of teenage boyfriend and girlfriend. A moment later, you see a scene of the teenagers all grown up. Married with kids. The director expects the audience to make the mental transition.
So there's nothing intrinsically suspect about the notion that Bible prophecies contain chronological gaps. Indeed, if you think it about it, that's to be expected. And there'd be no interruptions in the text (hence, no textual clues) since the mechanics of recording the experience are fundamentally different from the mechanics of the recorded experience.
The interesting question isn't whether there may be the occasional prophetic gap, but whether a reader is even aware of where they lie, in which case prophecy might be riddled with gaps.